It's all been leading up to this.
By now the agents have been cooperating with the King for some time, to their mutual benefit. However the King has feet of clay, and that's about to become a problem. This should start with some kind of personal reversal followed immediately by temptation, with the reversal out in the open and the temptation hidden, to be revealed when it's least convenient.
Exactly what that reversal is will depend on the nature of the King. The Politician suffers some political reversal and is banished to the outer reaches; something like the Department of Administrative Affairs, say, a career-ender for almost anyone. The Financial Mogul might see their business empire collapse, or it might be something more personal; the son in the coma finally dies. The Tech Guru's Dot-Com finally bombs. The Priest's campaign for a bishopric fails at the first hurdle. Or it could be something else entirely, related to events in your game.
Whatever it is, it happens in the open for all the world to see. The temptation is hidden. The Conspiracy reaches out, and this time the King takes the bait - or perhaps just seems to. Whichever it is, the agents find out and have to decide how much they trust the King after what's happened. Trust, like double-edged swords, cuts both ways. Perhaps the King feels they can no longer trust the agents, not completely. The King might feel guilty about being tempted and try to keep it from the agents at all costs, or perhaps the King's beginning to wonder if the agents are loyal to the King or the Conspiracy.
Thus the King sets up what amounts to a department of oversight; someone or some entity to watch over the agents' every move. The King wants to be absolutely certain the agents are to be trusted. Or perhaps the King is setting up some level of plausible deniability, so the King can publicly betray the agents and keep clean hands. "I had no idea what was being done in my name. but thank God I set a watchdog on them to gather evidence of their betrayal!"
Meanwhile external events are taking on a life of their own. The case for war in Iraq is gathering steam, and Blair's doing everything he can to help Bush. Alastair Campbell's putting together what will become known as the Dodgy Dossier. Dr. David Kelly, the weapons expert and former head of the Defence Microbiology Division at Porton Down, dies under circumstances best described as cloudy; nobody knows at the time whether it's suicide or murder. Those who favor murder claim it's because Dr. Kelly knew too much about how the Dodgy Dossier was put together.